Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires illuminate/support ^8.73 -> satisfiable by illuminate/support[v8.73.0, ..., v8.83.27]. - Root composer.json requires orchestra/testbench ^9.5 -> satisfiable by orchestra/testbench[v9.5.0, v9.5.1, v9.5.2]. - orchestra/testbench[v9.5.0, ..., v9.5.2] require laravel/framework ^11.11 -> satisfiable by laravel/framework[v11.11.0, ..., v11.28.1]. - Conclusion: don't install illuminate/support v8.83.27 (conflict analysis result) - Only one of these can be installed: laravel/framework[v11.11.0, ..., v11.28.1], illuminate/support[v8.73.0, ..., v8.83.27]. laravel/framework replaces illuminate/support and thus cannot coexist with it.